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Electrode for Electrolysis Cell

Active Publication Date: 2011-09-01
IND DE NORA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It becomes therefore necessary to identify a catalyst formulation for an electrode suitable for functioning as a chlorine-evolving anode in indus

Problems solved by technology

Beside the need for resorting to very high ruthenium loadings to obtain a satisfactory lifetime at the usual process conditions, such formulation has the disadvantage of a reduced overvoltage of the anodic oxygen evolution reaction.
This causes the concurrent anodic oxygen evolution reaction to be not effectively inhibited, so that product chlorine presents an oxygen content which is too high for some uses.
In general, catalysts capable of sufficiently lowering the overvoltage of the chlorine evolution reaction, so as to guarantee an acceptable energy efficiency, tend to have the same effect on the concurrent oxygen evolution reaction, giving rise to a product of unsuitable purity.
The activity of this electrode—in terms of cell voltage and consequently of energy consumption—is nevertheless not yet ideal for the economics of a large scale industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0034]A piece of titanium mesh of 10 cm×10 cm size was sandblasted with corundum, cleaning the residues of the treatment by means of a compressed air jet. The piece was then degreased making use of acetone in a ultrasonic bath for about 10 minutes. After a drying step, the piece was dipped in an aqueous solution containing 250 g / l of NaOH and 50 g / l of KNO3 at about 100° C. for 1 hour. After the alkaline treatment, the piece was rinsed three times with deionised water at 60° C., changing the liquid every time. The last rinsing step was carried out adding a small amount of HCl (about 1 ml per litre of solution). An air-drying was effected, observing the formation of a brown colouring due to the growth of a thin film of TiOx.

[0035]100 ml of a 1.3 M hydroalcoholic solution of the Ti-based precursor, suitable for the deposition of a protective layer of 98% Ti, 2% Ta molar composition were then prepared, making use of the following components:

65 ml of 2 M Ti hydroxyacetochloride complex ...

example 3

[0045]A series of samples tagged as A02-A11 was prepared with the reagents and the methodology as in Example 1 starting from pieces of titanium mesh of 10 cm×10 cm size pre-treated as above indicated and provided with a protective layer of 98% Ti, 1% Bi, 1% Nb molar composition, then with a catalytic layer having the composition and the specific noble metal loading reported in Table 1.

example 4

[0046]A series of samples tagged as B02-B11 was prepared with the reagents and the methodology as in Example 2 starting from pieces of titanium mesh of 10 cm×10 cm size pre-treated as above indicated and provided with a protective layer of 98% Ti, 2% Ta molar composition, then with a catalytic layer having the composition and the specific noble metal loading reported in Table 1.

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Abstract

The invention relates to an electrode formulation comprising a catalytic layer containing tin, ruthenium, iridium, palladium and niobium oxides applied to a titanium or other valve metal substrate. A protective layer based on titanium oxide modified with oxides of other elements such as tantalum, niobium or bismuth may be interposed between the substrate and the catalytic layer. The thus obtained electrode is suitable for use as an anode in electrolysis cells for chlorine production.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of PCT / EP2009 / 064998 filed Nov. 11, 2009, that claims the benefit of the priority date of Italian Patent Application No. M12008A002005 filed Nov. 12, 2008, the contents of which are herein incorporated by reference in their entirety.FIELD OF THE INVENTION[0002]The inventions relates to an electrode suitable for functioning as an anode in electrolysis cells, for instance as an anode for chlorine evolution in chlor-alkali cells.BACKGROUND OF THE INVENTION[0003]The electrolysis of alkali chloride brines, for instance of sodium chloride brine for the production of chlorine and caustic soda, is often carried out with titanium or other valve metal-based anodes activated with a superficial layer of ruthenium dioxide (RuO2), which has the property of lowering the overvoltage of anodic chlorine evolution reaction. A typical formulation of catalyst for chlorine evolution consists of a RuO2 and TiO2 mixture, which h...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B11/08C25B9/08B05D5/12B05D3/02B05D1/36C25B9/19
CPCC25B1/46C25B11/0484C25B11/0426C25B11/069C25B11/093C25B15/08
Inventor URGEGHE, CHRISTIANMOROZOV, ALEXANDERCALDERARA, ALICEDI FRANCO, DINO FLORIANOANTOZZI, ANTONIO LORENZO
Owner IND DE NORA SPA
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